metropolis vs New Haven

metropolis and New Haven both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
New Haven	Yes	No	No	No

metropolis (noun)	New Haven (noun)
people living in a large densely populated municipality	a city in southwestern Connecticut; site of Yale University
a large and densely populated urban area; may include several independent administrative districts